repr. Gr. λαμπρο-, combining form of Gr. λαμπρός bright, shining, as in: Lamprophane [Gr. φαν-, φαίνειν to show] Min., a mineral occurring in long, thin, cleavable folia at Longban, Wermland, Sweden (Cassell, 1885); Lamprophoner [Gr. φωνή + -ER.], an instrument for increasing the intensity of sound; so Lamprophony, a term for a clear and sonorous state of the voice (Mayne, Expos. Lex., 1855); Lamprophyre [Gr. (πορ)φύρεος purple: see PORPHYRY], the name given by Gumbel to rocks, considerably varied in lithological character, occurring in dikes in strata of palæozoic age; hence Lamprophyric a., of or pertaining to lamprophyre (Cent. Dict.); Lamprotype [Gr. τύπος type] Photogr., a paper print glazed with collodion and gelatine (Cent. Dict.).
1875. Knight, Dict. Mech., Lamprotype (Photography), a polished collodion picture.
1897. Amer. Ann. Deaf, June, 265. In the Indiana Institution experiments are in progress with the ‘lamprophoner,’ an instrument which … increases the intensity of sound.
